Aliased coefficient problem in R mma package

Question

I am trying to replicate Yu's example code for mediation analysis but keep getting this error:

library("mma")
data("weight_behavior")
x=weight_behavior[,2:14]
pred=weight_behavior[,3]
y=weight_behavior[,15]
data.bin<-data.org(x,y,pred=pred,contmed=c(7:9,11:12),binmed=c(6,10),binref=c(1,1), catmed=5,catref=1,predref="M",alpha=0.4,alpha2=0.4)

Error in Anova.III.LR.glm(mod, singular.ok = singular.ok) : there are aliased coefficients in the model

I understand this is because of collinearity but don't know how to fix it. Any help is much appreciated, Thanks